#! /bin/sh
# Inspired by https://github.com/cmur2/munin-openweather
# Steve Schnepp

# This part is taken from the original plugin
# Example usage:
#  Do
#    ln -s /path/to/openweather_ openweather_<type>_<id>
#  where <type> is currently ignored (formerly one of
#  [station, weather]) and <id> is a suitable
#  city id from http://openweathermap.org/
#  These parameters translate directly into a URL formed like this:
#    http://openweathermap.org/data/<api>/weather?id=<id>
#
# Example config:
#  [openweather_*]
#

entity_id=${0##*_}
TMPFILE=$(mktemp)
trap 'rm -f $TMPFILE' EXIT

KELVIN_BIAS=273

curl -s "http://openweathermap.org/data/2.5/weather?id=${entity_id}" | tr ':{},' '   \n' > $TMPFILE

while read KEY VALUE EXTRA
do
	[ "$KEY" = '"main"' ] && KEY=$VALUE && VALUE=$EXTRA
	[ "$KEY" = '"temp"' ] && {
		VALUE=${VALUE%%.*}
		[ "$1" != "config" ] && echo "temp.value $(( $VALUE - $KELVIN_BIAS ))"
	}

	[ "$KEY" = '"name"' ] && {
		[ "$1" = "config" ] && {
			cat <<- EOF
			graph_title Temperature in ${VALUE}
			graph_args --lower-limit 0
			graph_vlabel Celsius
			graph_category weather
			graph_scale no
			graph_info This graph show the temperature in ${VALUE}
			temp.label temperature
			temp.info Temperature in degree Celsius
			temp.type GAUGE
			EOF
		}
	}
done < $TMPFILE

exit 0